PYTHIA  8.303
Public Member Functions | List of all members
HMETau2Meson Class Reference

Helicity matrix element for a tau decaying into a single scalar meson. More...

#include <HelicityMatrixElements.h>

Inheritance diagram for HMETau2Meson:
HMETauDecay HelicityMatrixElement

Public Member Functions

void initConstants ()
 Tau decay matrix element for tau decay into a single scalar meson. More...
 
void initHadronicCurrent (vector< HelicityParticle > &)
 Initialize the hadronic current for the helicity matrix element.
 
- Public Member Functions inherited from HMETauDecay
virtual void initWaves (vector< HelicityParticle > &)
 Initialize wave functions for the helicity matrix element. More...
 
virtual complex calculateME (vector< int >)
 Return element for the helicity matrix element.
 
virtual double decayWeightMax (vector< HelicityParticle > &)
 Return the maximum decay weight for the helicity matrix element. More...
 
- Public Member Functions inherited from HelicityMatrixElement
 HelicityMatrixElement ()
 Constructor and destructor.
 
virtual void initPointers (ParticleData *, CoupSM *, Settings *=0)
 Initialize the physics matrices and pointers. More...
 
virtual HelicityMatrixElementinitChannel (vector< HelicityParticle > &)
 Initialize the channel. More...
 
virtual double decayWeight (vector< HelicityParticle > &)
 Calculate the matrix element weight for a decay. More...
 
virtual void calculateD (vector< HelicityParticle > &)
 Calculate the decay matrix for a particle. More...
 
virtual void calculateRho (unsigned int, vector< HelicityParticle > &)
 Calculate the density matrix for a particle. More...
 
void setFermionLine (int, HelicityParticle &, HelicityParticle &)
 Set a fermion line. More...
 
virtual complex breitWigner (double s, double M, double G)
 Calculate Breit-Wigner's with running widths and fixed. More...
 
virtual complex sBreitWigner (double m0, double m1, double s, double M, double G)
 Return an s-wave BreitWigner.
 
virtual complex pBreitWigner (double m0, double m1, double s, double M, double G)
 Return a p-wave BreitWigner.
 
virtual complex dBreitWigner (double m0, double m1, double s, double M, double G)
 Return a d-wave BreitWigner.
 

Additional Inherited Members

- Protected Member Functions inherited from HMETauDecay
virtual void calculateResonanceWeights (vector< double > &, vector< double > &, vector< complex > &)
 Calculate complex resonance weights given a phase and amplitude vector.
 
- Protected Attributes inherited from HelicityMatrixElement
double DECAYWEIGHTMAX
 Maximum decay weight. WARNING: hardcoded constant.
 
vector< GammaMatrixgamma
 Physics matrices.
 
vector< int > pMap
 Particle map vector.
 
vector< int > pID
 Particle ID vector.
 
vector< double > pM
 Particle mass vector.
 
vector< vector< Wave4 > > u
 Wave functions.
 
ParticleDataparticleDataPtr
 Pointer to particle data.
 
CoupSMcoupSMPtr
 Pointer to Standard Model constants.
 
SettingssettingsPtr
 Pointer to Settings.
 

Detailed Description

Helicity matrix element for a tau decaying into a single scalar meson.

Member Function Documentation

void initConstants ( )
virtual

Tau decay matrix element for tau decay into a single scalar meson.

The maximum decay weight for this matrix element can be found analytically to be 4 * m_tau^2 * (m_tau^2 - m_meson^2). However, because m_tau >> m_meson for the relevant tau decay channels, this expression is approximated by m_tau^4. Initialize constants for the helicity matrix element.

Reimplemented from HelicityMatrixElement.


The documentation for this class was generated from the following files: